It sounds like you're doing reasonably well.
I have found that I'm somewhat cycling addicted. My body does much better if I ride at least once every 3 days or so. I'm mainly a commuter/utility rider, rather than a fitness rider. But, the same applies. Walking doesn't do it. It needs to be riding.
I was up to about 6000 to 7000 miles for the last 2 years, but unfortunately down by quite a bit this year.
In early Sept I did tent support for Cycle Oregon. Whew, for the first several days we were doing long days, and hard, heavy work that I wasn't accustomed to.
Halfway through I was getting pretty hobbled up. We had a half day at Diamond Lake, and I just had to drag the bike out for a loop around the lake. Then every day after that, I got in at least a few mines around camp. And, back to "normal".